Finding the Fourth Proportional to 12,357, 17,052.78 and 7,389

Step by Step Solution

1. Step 1: Write the proportion equation
   12,357 : 17,052.78 = 7,389 : x
2. Step 2: Convert to fraction form
   12,357/17,052.78 = 7,389/x
3. Step 3: Cross multiply
   12,357x = 17,052.78 × 7,389
4. Step 4: Simplify right side
   12,357x = 126,002,991.42
5. Step 5: Solve for x
   x = 126,002,991.42/12,357
6. Step 6: Final answer
   x = 10,196.89